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Bug 4302

Summary: [PATCH] SDL_DisableScreenSaver() not implemented for Win32
Product: SDL Reporter: Cameron Gutman <cameron.gutman>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 CC: flibitijibibo
Version: HG 2.0   
Hardware: x86_64   
OS: Windows 10   
Attachments: Implement WIN_SuspendScreenSaver

Description Cameron Gutman 2018-10-10 06:10:48 UTC 
Created attachment 3358 [details]
Implement WIN_SuspendScreenSaver

Copying from my attached changeset summary:

Creating a full-screen SDL renderer on Windows will keep the screensaver
suspended by DirectX, as is default for full-screen DX applications. However,
for applications that render in windowed-mode, the screensaver will
still kick in, even if SDL_DisableScreenSaver() is called or
SDL_HINT_VIDEO_ALLOW_SCREENSAVER is set to 0 (default). Implementing
a SuspendScreenSaver() function for Win32 fixes this behavior.
Comment 1 Sam Lantinga 2018-10-11 05:48:40 UTC 
Your patch is in, thanks!
https://hg.libsdl.org/SDL/rev/e9954c42ee01
Comment 2 Ethan Lee 2018-10-11 15:25:11 UTC 
One quick comment on this, just saw the commit...

In addition to ThreadExecutionState I also found this as a means of toggling the screensaver; the docs suggest this works as long as the PC isn't in power saving mode or in a locked state:

--------------------------------------------------------------------------------
void SetUp()
{
    SetThreadExecutionState(ES_DISPLAY_REQUIRED | ES_CONTINUOUS);

    UINT vParam = 0;
    if (SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, &vParam, 0))
    {
        if (vParam == 1)
            screenSaverWasEnabled = true;
        else
            screenSaverWasEnabled = false;
    }

    if (screenSaverWasEnabled)
        SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 0, 0, 0);
}

void TearDown()
{
    if (screenSaverWasEnabled)
        SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 1, 0, 0);
}
--------------------------------------------------------------------------------

This has been shipping in FEZ for a while, so we know it works, but it's also a pretty aggressive way to do this (you can even set the wallpaper with this function o_o).